SF4C Safety light curtain
2.4 Protection Area
17
In case the intrusion direction is not perpendicular to the sensing area, be sure to refer to the
relevant standard for details of the calculation (regional standard, specification of the machine
etc.)
Safety distance S
Sensing area
Intrusion direction
Dangerous part
Safety distance
!
DANGER!
Before designing the system, refer to the relevant standards of the
region where this device is to be used and then install this device.
Furthermore, the equation described on the next pages is to be
used only when the intrusion direction is perpendicular to the
sensing area, i.e. at a straight angle. If the intrusion direction is not
perpendicular to the sensing area, refer to the relevant standard
(regional standard, specification of the machine, etc.) for details of
the calculation.
The max. response time of the machine is from the point when the
machine receives the halt signal from this device to the point when
the dangerous part of the machine stops. The max. response time of
the machine should be timed with the actual machine.
The minimum size of the objects to be detected by the safety light curtain varies depending on
whether the floating blanking function is used or not, see page 84. The equation differs
depending on the case whether the minimum object to be sensed is larger than
∅
40mm or not.
Calculate the safety distance with the correct minimum size and the appropriate equation.
Floating blanking
not active
Floating blanking active at (Note)
Number of beam
channels
1 beam channel
2 beam channels
3 beam channels
Minimum object to
be sensed
∅
25mm
∅
45mm
∅
65mm
∅
85mm
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